Bit-forging machine



May 18 1926.

L. BORTKEWICZ BIT FORGING MACHINE Filed July 15, 1925 3 Sheets-Sheet l INVENTQH Lauie Borf/(ewicz.

his aHo r1727 May 18, 1926.

L. BORTKEWICZ BIT FORGING MACHINE 1925 3 Sheets-$heet 2 ed July 15 lNVENTOR Louie Borikewicz.

May 18 1926. 1,584,724

L. BORTKEWICZ BIT FORGING MACHINE Filed July 15 1925 3 Sheets-Sheet 5 I In I 7 I4 3 5 i I /I9b v k 27 C 2 FIG. 4

Louie Borf ltfr ri cz Patented May 18, 1926.

are

\ LOUIE BOBTKEXVEGZ,

OF RACUON STATIEON, PENNSYLVANIA.

BIT-FORGING MACHINE.

Application filed July 15, 1925. Serial This invention relates to a die forging machine, and particularly to a die forging machine for use in making or reforging cutter bits for undercutting machines used in coal mines and the like.

One object of the invention is to provide a machine in which a cutter bit, or generally similar article, is formed by a succession of relatively light blows, thus obviating the necessity for subjecting the stock to a considerable pressure, and resulting in the production of a true forging at each oper ation.

A further object of the invention is to provide a die forging machine in which a plurality of movable dies are actuated by simple connections and from a single moving part, and which is so arranged as to embody few and simple adjustments.

Another object of the invention is to provide a die forging machine of the character indicated, which may be utilized successfully by an unskilled operator.

A still I further object of the invention is to provide means associated with, and operated by, the die forging mechanism proper for tempering finished articles which have been forged by the machine.

In the accompanying drawings Figure 1 is a side elevation of the machine of the present invention; Figure 2 is a plan view of the same; Figure 3 is a front elevation of the machine; Figure a is a fragmentary vertical sectional view on the line ll Figure 3; Figure 5 is a. cross sectional view, taken on the diagonal section line 5+5 of Figure l; Figure 6 is an isometric view of a stocl: from which a cutter bit is to be forged, and Figure 7. is an isometric view of a completed cutter bit.

The machine comprises a bed or table 1 supported by a frame A driving shaft 3 mounted transversely of the bed or table in bearings 4, and is provided at both ends thereof with pulleys 5. In use of the machine one of the pulleys is connected with a source of power, while the other acts as a balance wheel for the shaft.

A slide bar 6 is mounted for reciprocating movement in brackets 7 and 8 of the table 1. The rearward extremity of the slide bar 6 is operatively connected with the driving shaft 4 of the machine. These connections comprise a. link 9 connecting the end of the slide bar with a pivoted rod 9, which is pivotally secured to the end of a pitman 10. At its forward extremity pitman 10 has an eccentric connection 11 with the drivin shaft 8 of the machine, so-that rotationof the shaft produces reciprocating movement of the sliding bar 6.

The means for positioning stock to be forged comprises aslide bar 12 which is normally maintained in its rearward position in the machine by means of a coiled spring Secured to the slide bar 12 is a block or stock holder 1 1,'which has a hollowed portion '15 for the reception of a stock or bit to be forged. At its rear, this hollowed portion 15 is bounded by a curved member or bar 16, which extends forwardly and downwardly of the machine.

The means for operating the sliding bar 12, and its associated elements, comprise a treadle 17, which is pivoted at 18 in the frame 2 of the machine. Treadle 17 is connected by a rod 18 with one arm 19 of a bell crank 19, which is pivoted at 20 in the frame 2. The other arm 19 of the bell crank bears against the rearward extremity of the block, or stock holder, 1% for forcing this member and slide bar 12 forwardly. Pivotally mounted in block 14; is a feed bar 21, having an operating handle 22. This bar is arranged to bear against the inner surface of the curved member 16.

Adjacent the forward extremity of table 1 is stationary die holder 23, in which is secured a stationary die 24.

To feed the stock, treadle 17 is depressed. producing forward movement of slide bar 12, and stock holder 14, against the resistance of coiled spring 13. A stock 25, or bit to be reforged 26, is then dropped into the hollowed portion 15 of the block 14, and allowed to pass downwardly along the feed bar 21 to the curved member 16. If a piece of stock 25 is to be formed into a cutter hit, one corner 25 is previously bevelled off. Vi hen the stock has been inserted in the feeding mechanism, treadle 17 is released and the slide bar 12, carrying stock holder 1%, is moved back to operative, or forging position by the coiled spring 18.

During this action the extremity of feed bar 21 remains in contact with the forward surface of the curved member 16. For ward or outward movement of the operative extremity of the feed bar, to cause accidental discharge of the stock from the feeding mechanism, is prevented by means of a llshaped arm 27 which is pivoted at movement of ftvi 'ard movementof the l l bar 't'or resista Cihen has been inserted, handle 22 is l} to slide the stock upwardly alone the surface of curved member 16 am through an aperture 30 in die 21 into forging position. 'he stock is maintained in this position during the forging operation by a continued. depression of the handle which maintains the feed bar 21 in post tion to hold the stock in the die 2%.

With the stock positioned in die 21-, it is acted upon by die 31, which is adjustably mounted in the forward portion of slide bar (3 by means of a se so *ew orthe like During; the forging operation the stock is acted upon not only by the stationary die 21-, and the die 31 carried by the slide bar; but Is also acted upon by a pair of dies 33, which have shanks 33 extending through apertures Llin the table or bed 1. These shanks ills-are pivoted at 35 to the frame of the machine. These pivoted dies are-positively actuated so that they perform a hammering action on the stock being forged.

The operating connections for the pivoted dies 33 are so arranged that these dies are actuated by movement of the slide bar (3 For this purpose two actuating arms 36 are mounted for oscillatory inovenientat the points 37 in the bracket 8. Adjacentthe rearward extremity of each arm is a notch 38 in which a hook shaped cont: ct member 39 has a pivotal mounting- -10. Projecting: through each of the aans 36 11d bearing against the hooked contact members 39. are adjusting screws 1 1 for regulating the extension of the contact 12 embers inwardly from the arms. On the sl'de bar 6 are a pair or" contact arms l which are plTOtzllly mounted at and l' l .i end outwardly from and rearwardlv ol' the slide bar 6. lldjacenttheir extremity ach of the actuating arms 36 is provided with :1 lug: 4:4: which has a rounded surface for contacting the outward face of that one of the dies 33 to be actiat by that Jarticular arm. Leaf springs in, arranged to bear againstthe shank 33 of each of the dies, exert a force icininej o press the dies outwardly from the ,jc

5 all fel forward movemen a ies fontact with on the actuatforces 5-1), which is disposed ad acent the (i1 c-xtrennty of the chute in del ver a extent of their outward movement being in creased by the tendency otthe contact a1."

to assume a position perpendicular i slidin; bar. This oscillation of the actual lug arms 36 causes their rearward pr tions in n the pa h :de bar (3.

Yfhen the ilOl'Q'lllg' operation he: ocei: coin- .pleled, the handle s'forced r 1 wardl so that the l eed brr 2t is swung outwardly L ins the lug :3 on arm 2 This inits the finished work to fall tlwongh :1 tore i -3O and along; the surface A guide-member l", and to drop livery chute 26.

Special means for tempe as it finished are ass elated forging mechanism prop-e compri e a pr are tank -l-. water, or any suitable tern From tank l7 lead a liquid fluid pressure pipe l9. pipes are lr-oth connected with a spray pi he work it: (he

teu'ipering spray to g char t by the chute. Br: main tamed 1n the tank -l-T by me: 15 ot a duct 51, which leads to a liuid compressor 51;: mounted on the table or bed 1. Q pressor 52 is mounted in a" the slide bar 6. and its piston or plunger 53'is connected by means of pistni rod :3 with the slide bar adjacent the rearwaid extremity of the latter.

Reciprocation of the slide bar 6 thus: pr. duces three effects "in general operation: the die actuall c ricd by the slide lJt r'to act upon the SlIlC, second it pr duces actuation of pivoted causing them also to act on the sioc 1t- COIlPlBSS-S fluid for delhierin a t n. spray to the completed lit/inclines.

The only adjustments lQQUllOt by the mechanism are the longitudinal adjustment of the diet-31in the slide bar 6, and the adjustinent of the contact IHQHlhLIS 3:) in the actuating a his 36. These adjustments (Oinpensate'fo wear on the lace ol the die. the size of the stock, or may be made to regulziie the force ot the blows delivered during; eat-h reciprocation otthe slide bar.

It the n'iachine beplaced close to a forge, a single operator may asily conduct the entire operation. It is merely necessary to operate the'proper handles and to release the forgingwlien completed. The tempering spray may bedeliverc'd continuously during'the operation ol the machine, sothat it knl requires no attention on the part of the operator. As the forging is effected by a succession of relatively light blows, the stock may be Watched, and released at the proper moment without interrupting the movement of the sliding bar. This results in the production of forgings of uniform excellence.

What I claim is: I

1. In a forging machine the combination of a stock holder a reciprocable die holder, pivotally mounted dies, and connections arranged to produce action of the pivoted dies on the stock during movement of the reciprocable die holder away from the stock.

2. In a forging machine the combination of a stockholder, a sliding bar, pivoted arms arranged to be oscillated by reciprocation of the sliding bar during movement of the sliding bar away from the stock, and dies arranged to be actuated by said pivoted arms to act upon the stock.

3. In a forging machine the combination of a sliding bar having a die thereon, a slidable stock holder, resilient means for main taining said stock holder in operative position in the path of said sliding bar, and means for moving the stock holder into charging position against the resistance of said resilient means.

4. In a forging machine the combination of a sliding bar having a die thereon, a slidable stock iolder, resilient means for maintaining said stock holder in operative position in the path of the sliding bar, connections for moving the stock holder into charging position against the resistance of said resilient means, and means for positioning stock in said holder in the path of said sliding bar.

5. In a forging machinethe combination of a sliding bar having a die thereon, a slidable stock holder, means for moving the stock holder between charging position and its operative position in the path of the sliding bar, and cooperating dies arranged tobe actuated by movement of the sliding bar;

6. In a forging machine the combination of a sliding bar having a die thereon, a slidable stool: holder, resilient means for maintaining said stock holder in operative position in thepath of said sliding bar, means for moving the stock holder into charging position against the resistance of said resilient means, and cooperating dies arranged to be actuated by movement of the sliding bar.

7. In a forging machine the combination of a sliding bar having a die thereon, a slidable stock holder, resilient means for maintaining said stock holder in operative position in the path of the sliding bar, connections for moving the stock holder into charging position against the resistance of said resilient means, means for positioning stock in said holder in the path of the sliding bar, and cooperating dies arranged to be actuated by movement of the sliding bar.

8. In a forging machine the combination of a sliding bar having a die thereon, a slidable stock holder, resilient means for maintaining the stock holder in operative position in the path of the sliding bar, means for moving the stock holder into charging position, pivoted dies, and connections arranged to produce action. of the pivoted dies on the stock during recessive movement of the sliding bar.

9. In a forging machine the combination oi a sliding bar having a die thereon, a slidable stock holder, resilient means for maintaining the stock holder in operative position in the path of the sliding bar, pivoted dies, and connections arranged to transmit movement of the sliding bar to the pivoted dies for actuating the same.

10. In a forging machine the combination of a sliding bar having a die thereon, a slidable stock holder, resilient means for maintaining the stock holder in operative position in the path of the sliding bar,

pivoted arms arranged to be oscillated by reciprocation of the sliding bar, and dies arranged to be actuated by said pivoted arms to act upon the stock.

11. In a forging machine the combination of: a sliding bar having a die thereon, a slidable stock holder, means for moving the stock holder between charging position and its operative position in the path of the sliding bar, pivoted arms arranged to be oscillated by reciprocation oi the sliding bar, and dies arranged to be actuated by said pivoted arms to act upon the stock.

12. In a forging machine the combination oi a reciprocable die holder, a stock holder, contact members on said die holder, pivoted arms having portions extending toward the path of movement of the reciprocable die holder for producin oscillation of the arms during movement or the die holder away from the stock holder, and pivotally mounted dies arranged to be actuated by oscillation of such arms to act upon the stock.

13. In a forging machine the combination oi a reciprocable die holder, a stock holder, pivoted arms having portions extending toward the path of movement of the die holder, contact members pivotally mounted on said die holder for contacting the extending portions on the arms and oscillating the arms during movement of the die holder away from the stock holder, and pivotally mounted dies arranged to be actuated by said'pivoted arms to act upon the stock.

1a. In a forging machine the combination of a reciprocable die holder, contact members on said die holder, a stock holder, pivoted arms having adjustable members thereon extending toward the path of movement of the die holder for producing oscilation of the arms during 1 iovement of the he holderaway from-the s och holder, and iivotally mounted (be; arranged to he actuated by oscillation ot'the'arms to zit-t. upon he stock.

15. In aiorgiug nmehine the comhi ation it a l'Ci'iPlfLZQElblU dieholder a steel: holeer, iii'oted arms, adjustable Contact IDOH'llJGl'S on Said arms extemiling toward the path of movement of the die holder, pivoted contari; members; on said die holder arranged to engage the Contact members on the ar us for oscillating the 21 111E; during movement of the die holder away from the stock holder,

and pivotally mounted dies ar be actuated by oscillation of the arms movable e g in de tinged at upon the -toek.

16. In a die forging machine a iOid r comprising a downwardly exten'o IDOD'llZ'LI having feeding: of sioeleeide members. and a Otally mounted member so arranged that ,JHldQ nieineer ha mg a cuiweu Siiriare im during oscillation thereof its (.(lz'tll'lil) is in contact with the unwed L-lii'iiltt? iii' the guide member.

18. In a llIlO 1i stool: \flt'lllY extending guide member array: f-.l

for the feeding 0 ice n'ieniberx, a movable teed bar arrar fled to cooperate with the feed riiirt aceo't .1- (l i I do member. and

yielding means "for nor n preventing movement of the operati 0 end of the feed lJ-zir outwardly lJjfUIHl the (.'.-;t C-111li oi the {IlliClG member.

19.111 :1 die forging 1122(fl11110 a Sl'Ot'l-I holder conipriein a downwaiwlly Cfiillltlil 11' 11 Le member having a. cur Jli'fflCO for the teeding of stock. Sldt. mend is. a p1rot mted member so arranged that. durand 'ielding mean norn'ially i i 2' 1 oscillation of th teed member into position with its extremi beyond the eritreznit oi the guide member. In 

